Austin's grid has had enough multi-day outages that homeowners there tend to ask about standby power unprompted. For a house running Crestron control, Lutron lighting, and a managed network, the question worth resolving at design time is not whether to add backup power but what a UPS actually buys before a generator has to pick up the load, and what should be excluded from that generator circuit in the first place.
What a rack UPS actually buys you
A UPS in the equipment rack is a bridge, not a backup power plan. Ubiquiti's own numbers make the limit clear: the UPS-2U Pro is rated for up to 22 minutes of runtime at half load (960W) on its 720Wh battery, the smaller UPS-2U gives about 8 minutes at half load, and the UPS Tower is rated around 7 minutes at half load (UPS 2U Pro - Ubiquiti Store, UPS Tower - Ubiquiti Store). Those numbers assume the UPS is loaded at roughly half its rated capacity; a fully loaded rack of switches, an NVR, and a controller draws it down faster. That runtime is enough to ride out a blip or a brief utility transfer — it is not enough to get a network and control system through even a short neighborhood outage, let alone a multi-day grid event.
Crestron's own UPS documentation describes the same role: a UPS "constantly monitors the incoming power line and instantly transfers power to battery backup," and "when running on battery backup, [it] can power a rack full of equipment for several minutes without interruption" — intended to bridge to either a managed shutdown or a generator pickup, not to run the house indefinitely (CEN-UPS1250 — Crestron). Note that both the CEN-UPS1250 and the Green Light GLA-UPS are listed by Crestron as discontinued; they describe how rack UPS integration has worked, not what to specify new. A current design should ask what UPS product line a Crestron or Lutron dealer is specifying today, and confirm its runtime at the rack's actual load, not the half-load number on the spec sheet.
A sensible design question for your integrator: which loads get UPS priority during that short bridge window? Crestron's documentation for its UPS products describes configurable load-shedding that shuts down less-critical banks first to extend runtime for the control processor and network gear specifically — a feature worth asking whether the current platform still supports, since the product that documented it is no longer sold.
Why the alarm panel is a separate question from the rack
The security panel does not depend on the rack's UPS at all, and that is by design. Alarm.com's own explanation of outage behavior notes that its panel carries its own 24-hour battery backup and signals over a dedicated cellular connection, independent of broadband or phone lines, specifically so monitoring keeps functioning "if there's an emergency at your home" during a power outage (How Alarm.com Helps in a Power Outage). That same source describes outage alerts sent to a homeowner's phone once an outage passes about ten minutes, along with a map showing what percentage of nearby homes are also affected — useful for judging whether an outage is a downed line or a grid-wide event before deciding whether to wait it out. Ask your alarm provider whether Cave Watch Central's monitoring platform on Alarm.com carries that same independent battery and cellular path at your address, since panel battery capacity and backup communication paths vary by installation.
Where the generator and ATS fit
None of this replaces a generator. A UPS exists to bridge the gap between utility loss and either a clean automatic shutdown or a standby generator picking up the load — it is not sized to run a house's network, control processors, and cameras through a multi-day outage on battery alone. For Austin houses prone to extended grid outages, standby power is worth raising as a design question from the start, not an afterthought: generator sizing, placement, and the battery-backed rack belong in the same conversation as where the equipment goes and what the local tree and impervious-cover rules allow for exterior equipment, a topic covered on Cave Group's Austin service page.
A few questions worth raising with whoever designs the automatic transfer switch and generator:
- How long is the gap between utility loss and generator pickup, and does the rack's UPS runtime comfortably exceed that gap even at full rack load, not half load?
- Which circuits actually need standby power — the rack, the network, security, and refrigeration are reasonable candidates, while high-draw loads like a whole-house HVAC system or an EV charger are a separate conversation with the electrician about generator sizing?
- When utility power returns, does the system need a manual reboot, or can the control processor and network gear restart in a defined sequence automatically? Crestron's own UPS documentation for sequential, delayed-start outlet banks exists specifically to avoid the transients that come from everything powering back up at once.
These are design decisions, not installation afterthoughts, and they belong on the drawings before the rack room is built out — something worth raising on Cave Group's networking upgrade page for houses whose existing racks were never designed with outage runtime in mind.
What this means for a new Austin build
None of the manufacturer runtime figures above are Austin-specific — they are the same numbers that apply anywhere a Crestron or Lutron rack sits behind a UPS. What is Austin-specific is how often local outages run long enough to make the question worth asking before the rack room is framed. Cave Group designs Austin projects from the drawings with standby power as part of the conversation, works with Texas-licensed electrical and security contractors on the line-voltage and alarm work the state licenses separately, and supports the result afterward with Cave Watch monitoring once the house is occupied. The specific UPS model, generator size, and transfer-switch configuration are decisions for your electrical contractor and integrator to size against your actual rack load and your utility territory's outage history, rather than a generic number.